/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch licenses this file to you under
 * the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.elasticsearch.common.util;

import static org.assertj.core.api.Assertions.assertThat;

import org.elasticsearch.test.ESTestCase;
import org.junit.Test;

public class BigArraysTests extends ESTestCase {

    @Test
    public void testOverSizeUsesMinPageCount() {
        final int pageSize = 1 << (randomIntBetween(2, 16));
        final int minSize = randomIntBetween(1, pageSize) * randomIntBetween(1, 100);
        final long size = BigArrays.overSize(minSize, pageSize, 1);
        assertThat(size).isGreaterThanOrEqualTo(minSize);
        if (size >= pageSize) {
            assertThat(size % pageSize)
                .as(size + " is a multiple of " + pageSize)
                .isEqualTo(0L);
        }
        assertThat(size - minSize).isLessThan(pageSize);
    }
}
